add 添加美赛 MCM/ICM 竞赛相关文件并更新文档

增多份与美赛 MCM/ICM 竞赛题目及配套资料相关的 PDF、DOCX、TEX、CSV 格式文件，对部分文件进行重命名与重新整理，优化文件结构；更新一份 Markdown 文档，在建模思路中补充有限元分析相关内容。

论文/latex模板.tex

@@ -0,0 +1,76 @@
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% MCM/ICM LaTeX Template %%
+%% 2026 MCM/ICM           %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\documentclass[12pt]{article}
+\usepackage{geometry}
+\geometry{left=1in,right=0.75in,top=1in,bottom=1in}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Replace ABCDEF in the next line with your chosen problem
+% and replace 1111111 with your Team Control Number
+\newcommand{\Problem}{ABCDEF}
+\newcommand{\Team}{1111111}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\usepackage{newtxtext}
+\usepackage{amsmath,amssymb,amsthm}
+\usepackage{newtxmath} % must come after amsXXX
+
+\usepackage[pdftex]{graphicx}
+\usepackage{xcolor}
+\usepackage{fancyhdr}
+\lhead{Team \Team}
+\rhead{}
+\cfoot{}
+
+\newtheorem{theorem}{Theorem}
+\newtheorem{corollary}[theorem]{Corollary}
+\newtheorem{lemma}[theorem]{Lemma}
+\newtheorem{definition}{Definition}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{document}
+\graphicspath{{.}}  % Place your graphic files in the same directory as your main document
+\DeclareGraphicsExtensions{.pdf, .jpg, .tif, .png}
+\thispagestyle{empty}
+\vspace*{-16ex}
+\centerline{\begin{tabular}{*3{c}}
+	\parbox[t]{0.3\linewidth}{\begin{center}\textbf{Problem Chosen}\\ \Large \textcolor{red}{\Problem}\end{center}}
+	& \parbox[t]{0.3\linewidth}{\begin{center}\textbf{2026\\ MCM/ICM\\ Summary Sheet}\end{center}}
+	& \parbox[t]{0.3\linewidth}{\begin{center}\textbf{Team Control Number}\\ \Large \textcolor{red}{\Team}\end{center}}	\\
+	\hline
+\end{tabular}}
+%%%%%%%%%%% Begin Summary %%%%%%%%%%%
+% Enter your summary here replacing the (red) text
+% Replace the text from here ...
+\begin{center}
+\textcolor{red}{%
+Use this template to begin typing the first page (summary page) of your electronic report. This \newline
+template uses a 12-point Times New Roman font. Submit your paper as an Adobe PDF \newline
+electronic file (e.g. 1111111.pdf), typed in English, with a readable font of at least 12-point type.	\\[2ex]
+Do not include the name of your school, advisor, or team members on this or any page.	\\[2ex]
+Be sure to change the control number and problem choice above.	\\
+You may delete these instructions as you begin to type your report here. 	\\[2ex]
+\textbf{Follow us @COMAPMath on X or COMAPCHINAOFFICIAL on Weibo for the \newline
+most up to date contest information.}
+}
+\end{center}
+% to here
+%%%%%%%%%%% End Summary %%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\clearpage
+\pagestyle{fancy}
+% Uncomment the next line to generate a Table of Contents
+%\tableofcontents
+\newpage
+\setcounter{page}{1}
+\rhead{Page \thepage\ }
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+Begin your paper here
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\end{document}
+\end